import { openWindow } from '..';
import { dataURLtoBlob, urlToBase64 } from './base64Conver';

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
   urlToBase64(url).then((base64) => {
      downloadByBase64(base64, filename, mime, bom);
   });
}

/**
 * Download pictures based on base64
 * @param buf
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByBase64(buf: string, filename: string, mime?: string, bom?: BlobPart) {
   const base64Buf = dataURLtoBlob(buf);
   downloadByData(base64Buf, filename, mime, bom);
}

/**
 * Download according to the background interface file stream
 * @param {*} data
 * @param {*} filename
 * @param {*} mime
 * @param {*} bom
 */
export function downloadByData(data: BlobPart, filename: string, mime?: string, bom?: BlobPart) {
   const blobData = typeof bom !== 'undefined' ? [bom, data] : [data];
   const blob = new Blob(blobData, { type: mime || 'application/octet-stream' });

   const blobURL = window.URL.createObjectURL(blob);
   const tempLink = document.createElement('a');
   tempLink.style.display = 'none';
   tempLink.href = blobURL;
   tempLink.setAttribute('download', filename);
   if (typeof tempLink.download === 'undefined') {
      tempLink.setAttribute('target', '_blank');
   }
   document.body.appendChild(tempLink);
   tempLink.click();
   document.body.removeChild(tempLink);
   window.URL.revokeObjectURL(blobURL);
}

/**
 * Download file according to file address
 * @param {*} sUrl
 */
export function downloadByUrl({
   url,
   target = '_blank',
   fileName,
}: {
   url: string;
   target?: TargetContext;
   fileName?: string;
}): boolean {
   const isChrome = window.navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
   const isSafari = window.navigator.userAgent.toLowerCase().indexOf('safari') > -1;

   if (/(iP)/g.test(window.navigator.userAgent)) {
      console.error('Your browser does not support download!');
      return false;
   }
   if (isChrome || isSafari) {
      const link = document.createElement('a');
      link.href = url;
      link.target = target;

      if (link.download !== undefined) {
         link.download = fileName || url.substring(url.lastIndexOf('/') + 1, url.length);
      }

      if (document.createEvent) {
         const e = document.createEvent('MouseEvents');
         e.initEvent('click', true, true);
         link.dispatchEvent(e);
         return true;
      }
   }
   if (url.indexOf('?') === -1) {
      url += '?download';
   }

   openWindow(url, { target });
   return true;
}
